Improvement in friction-clutches for belt-pulleys



iff

N-FELERS, FMOmuTMOGRAPHER. WASHINGTON. 0.x;

JAMES H. BLESSN G, OF ALBANY, NEW YORK, ASSIGNOR TO HIMSELF AND TOWN SEND & JACKSON, 0F SAME PLAGE.

Letters Patent No. 113,841, dated- April 18, 1871.

IMPROVEMENT IN FRICTION-CLUTCHES FOR BELT-PULLEYS.

The Schedule referred to ln these Letters Patent and making part of the same.`

To all whom it may concern Be it known that I, JAMES H. BLEssrNG, of the city and county of Albany and State of New York, have invented a new and improved Friction-Clutch for Belt-Pulleys; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making part of this specification, in which- Figure l is an end View of a belt-pulley having my improved clutch applied to it.

' Figure 2 is a diametrical section through the pulley and clutch.

Similar letters of reference indicate corresponding parts in the 'several gures.

The object of this invention is toimprove frictionclutches for belt-pulleys, by the combination of expansible friction-pads, toggle-levers, and elastic abutments for such levers, as will be hereinafter explained.

The following description of my invention will enable others skilled iu the art to understand my invention.

In the accompanying drawing- A represents a belt-pulley, which is applied loosely upon its shaft B, and which has part of the inside surface of its rim turned smooth.

C represents a plate which is made fast to the shaft B, and which extends equal distances vfrom each side of the axis of said shaft. This plate C has dovetail grooves made into its face, into which slides D D are litted. These slides have segments G-on their outer ends, the outer surfaces of' which are turned to the same diameter as the inner tnmed surface of the rim of pulley A, and covered with leather g, or any other suitable soft frictional material.

- This leather g is secured to the segments by means of screws a fvg'.

Each segment or frictionpad G has two ears, h h, formed on its inner dat surface, to which a lever, E, is pivoted at t'.

The opposite end of lever E is pivoted-to a lever, E', by means of -a pin, 1J, which pin also affords a pivot for a link, n.'

The inner end of each lever E is slotted and connected to av two-part box, L, by means of a pin, s', which passes through the said slot, as shown by fig'. 2.

The box L is chambered, and into the chambers springs O O and plates 'xix are inserted between the. shaft B and the inner ends of the two levers EE', as shown iu iig. 2.

The links n n are pivoted vatj j to the'extremities 0f two arms, F F', on a sliding collar, F. This collar is annularly grooved'at t and applied loosely'on the shaft B.

J is a lever forgiving endwise movement to the eollar F and its arms, which leveris pivotedto a fixed post, K, and yoked at J.

By'means of pins s 's on lever J, working in the groove t-in collar E, the. clutch canbe operated .by vibratingr said lever.

It will be seen from the above description that I have a self-holding clutch-that is to say, when the collar F is moved toward the pulley the joints of the toggle-levers at 1) p will be moved from the positions indicated by the full lines in the same ligure, in which latter positions the toggles will abut against the slides D D.

This movementof the toggle's is permitted by the springs O 0, which are compressed, and which, by their recoil, hold the toggles iirmly in place when the friction-pads are applied to the rim of the pulley.

I am aware that expansible friction-pads have been applied to -belt-pulleys and operated in 'a' variety of ways before my invention, Vand I do not, therefore, claim such coutrivances.

What I do claim as new, and desire to secure by Letters Patent, is-

The elastic abntments 0 O, in combination with toggle-levers and expansible frictional pads G, substantially as described.

JAMES H. BLESSING.

Witnesses A. P. Srnevnns, J. A. REED. 

